LHCf 2015

• Questions from LMC:– LHCf run scheduled shortly after initial commissioning

– can it be delayed?– Present plan below. LHCf to removed at first

opportunity after run – i.e. TS1 in present planning

Following discussion with Hiroaki MENJO – 29th August 2014

Requirements

• Pilot run to qualify DAQ sometime before main run (pile-up not an issue)

• 11 m is OK – unsqueeze not needed for LHCf• 1.5e29 cm-2s-1, mu = 0.01, Nb < 40, half

crossing angle 140 microrad• Integrated luminosity: 10 nb-1

• Delivery rate about 0.5 nb-1/hour – need 20 hours Stable Beams – say 2 days plus set-up

Note

• If LHCf is exposed to the high radiation levels in the TAN associated with high luminosity – it will be damaged – 2 weeks maximum at high luminosity

• Installation time:– 1 working week– 1 to 2 days physical installation plus cabling and

electronics tests• Removal time: – 1 to 2 days for both sides

Delay run?

• If the run is not performed initially, the detector will have to be installed and tested during a later technical stop

• The run will have to take place reasonably soon after the technical stop to avoid damage

• 1 – 2 days within 2 weeks of the run will be required to removed the detectors

• Both installation and removal will have to take place in an irradiated area – this will not be the case if the run takes place during the initial period

• ALARA strongly favours doing the run as scheduled.